What is the vertex of a parabola represented by the equation f(x) = -2 (x-4)^2 - 7

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Find the solution(s) to x^2-14+49=0

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?